SOLUTION: A 150 mL solution of alcohol in water is 75% alcohol. How many mL of a 60% solution should be added to make the solution 72% alcohol?

Question 818669: A 150 mL solution of alcohol in water is 75% alcohol. How many mL of a 60% solution should be added to make the solution 72% alcohol?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
150(0.75) + v(0.60) = (150 + v)(0.72)
112.5 + v(0.60) = 108 + v(0.72)
v(0.12) = 4.5
v = 4.5/(0.12)
v = 37.5
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answer:
add 37.5 mL of 60% solution
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